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Energies 2020, 13, 6256 3 of 19 Energies 2020, 13, x FOR PEER REVIEW 3 of 21 pump in the waste heat recovery system is driven by the high-parameter steam turbine extraction low-grade waste heat from the turbine exhaust steam, thus heating the return water of the heating and absorbs the low-grade waste heat from the turbine exhaust steam, thus heating the return water network. The lithium bromide absorption heat pump is usually used to recover waste heat for thermal of the heating network. The lithium bromide absorption heat pump is usually used to recover waste power plants. However, due to the limitation of its output performance, the outlet temperature of the heat for thermal power plants. However, due to the limitation of its output performance, the outlet absorptionheatpumphasamaximumvalueoft′ .Inthefollowingch′apters,t′ andt′ areusedto temperature of the absorption heat pump hahspa maximum value of thp . In the foplloowing chpiapters, represent the design supply and return the water temperature of the heating network. po t′ and t′ are used to represent the design supply and return the water temperature of the heating network. pi In some cases, the outlet water temperature of the absorption heat pump may not satisfy the demands of heat users due to the limitation of its own performance. According to the relationship In some cases, the outlet water temperature of the absorption heat pump may not satisfy the between the outlet water temperature of the heat pump and the design supply water temperature, there demands of heat users due to the limitation of its own performance. According to the relationship aretwoconnbetcwtieoenthyepoeustloetfwheataetrintegmspyesratetumretohfathtecahneabtepumsepdanindtdhieffdeerseingntcsuopnpdlyitiwoantser.tWemhpeenrathuree,design there are two connection types of heating system that can be used in different conditions. When the supply water temperature is larger than the outlet water temperature of the heat pump, the heating design supply water temperature is larger than the outlet water temperature of the heat pump, the supply system is shown in Figure 1a. The outlet water of the heat pump can be heated to a higher heating supply system is shown in Figure 1a. The outlet water of the heat pump can be heated to a temperature in the heater of the heating network and finally delivered to the user side because the higher temperature in the heater of the heating network and finally delivered to the user side heaterofhebaetcinaugsentehtewhoearkteraonfdhetahteinhgenaetwpourkmapndartheechoenant peuctmepdairnescoenrinesc.teAdcincoserrdieisn.gAtcocotrhdienghetoathinegload heating load and the power of the heat pump, the water of the heating network is partly or fully and the power of the heat pump, the water of the heating network is partly or fully through the heat through the heat pump and fully through the heater for heating network. When the outlet water pump and fully through the heater for heating network. When the outlet water temperature of the temperature of the heat pump is greater than the design outlet water temperature of the heating heat pump is greater than the design outlet water temperature of the heating supply network, the heat supply network, the heat pump and the heater of the heating network should be connected in pump and the heater of the heating network should be connected in parallel, as shown in Figure 1b. parallel, as shown in Figure 1b. In this case, the heat pump and the heater for heating network In this case, othperhateaitnppuamralplela.nBdastehdeohnetahterhefaotrinhgelaotaidn,gthneehtweaoterrkforpheerattiengineptawroarlkleils.dBeatesremdinoendtthoebheeating is determined to be placed in operation or not. placed in operation or not. t′ pi load, the heater for heating network Steam turbine Extraction steam Generator Heater of heating network Cooling tower (a) t ́hp Supply Water of heating network t ́po t ́pi Return Water of heating network Boiler Condenser Feed water pump Energies 2020, 13, x FOR PEER REVIEW 4 of 21 (b) Figure 1. The heating supply system with the waste heat recovery system using an absorption heat Figure 1. The heating supply system with the waste heat recovery system using an absorption heat pump: (a) series connection type, (b) parallel connection type. pump: (a) series connection type, (b) parallel connection type. 2.2. Model of Heating Load Characteristics The distribution characteristics of the heating load must be studied to realize on-demand heating and decrease heating energy consumption. In the actual central heating system, the heating load is affected by many factors, such as building types, meteorological conditions, and geographical locations. Among these factors, the temperature difference between indoors and outdoors has the Absorption heat pump Heat consumer greatest influence on the heating load. The actual heating load mainly depends on the outdoorPDF Image | Waste Heat Recovery Turbine Exhaust Steam Heat Pump
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